3209689644409 has 2 divisors, whose sum is σ = 3209689644410. Its totient is φ = 3209689644408.

The previous prime is 3209689644391. The next prime is 3209689644523. The reversal of 3209689644409 is 9044469869023.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2586966644025 + 622723000384 = 1608405^2 + 789128^2 .

It is an emirp because it is prime and its reverse (9044469869023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3209689644409 - 2²¹ = 3209687547257 is a prime.

It is a super-2 number, since 2×3209689644409² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3209689644209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1604844822204 + 1604844822205.

It is an arithmetic number, because the mean of its divisors is an integer number (1604844822205).

Almost surely, 2^{3209689644409} is an apocalyptic number.

It is an amenable number.

3209689644409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3209689644409 is an equidigital number, since it uses as much as digits as its factorization.

3209689644409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80621568, while the sum is 64.

The spelling of 3209689644409 in words is "three trillion, two hundred nine billion, six hundred eighty-nine million, six hundred forty-four thousand, four hundred nine".